at one's mother's knee

US /æt wʌnz ˈmʌðərz niː/
UK /æt wʌnz ˈmʌðərz niː/
"at one's mother's knee" picture
1.

from a very early age; from childhood

:
He learned to play the piano at his mother's knee.
She was taught good manners at her mother's knee.